What to do? Clean sensor

Yesterday I noticed a small speck on my left top side of EVF, I carefully took of lens and saw this little speck o the opposite side of sensor. I didn't have a blower so what the best way to remove ? Or Safest? Can I just blow it carefully with my mouth?

i always change lens with body down, how it got in there, don't know. Was at beach yesterday maybe it was there.